Transactional Mailing Status
ignorant- Initial status of an email attempt. If you get a 200 API response, you will never see this status. NOTE: As of 1 November 2011, you may receive this state when a transactional mailing is queued (see Changes to Transactional Mailers API).
sending- This status is only set for the split second between when we start sending and finish sending an email attempt.
failed- This is the status you would see if you got a non-200 API response.
sent- Email attempt was successfully sent, but nothing else has happened yet.
received- The recipient has opened their email.
clicked_through- The recipient has clicked a link in their email.
bounced- The email bounced.
retried- We have resent a bounced email.
retry_failed- The bounce retry bounced.
forwarded- The "forward to a friend" link was clicked.
opted_out- The recipient clicked the "unsubscribe" link.
abused- The recipient clicked "Report Spam" link in Yahoo, Hotmail, Gmail, etc.